PDF malware analysis — malicious · 6c7948b90ce9543c

MALICIOUS

PDF

1.95 MB Created: 2010-07-26 20:29:47 Authoring application: biceUps biceLey

MD5: d48ce5b7cafc2c83fcb41516306e0455 SHA-1: 688d280bb184e9933d99c797cd97a7f81dc56d54 SHA-256: 6c7948b90ce9543c786f6cd677ef8f27ab958b23243cadb8c13b6954fe55b622

416 Risk Score

Malware Insights

MITRE ATT&CK

T1059.007 JavaScript T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF sample contains critical heuristics indicating JavaScript exploits targeting XFA forms, including heap spraying. The embedded JavaScript, heavily obfuscated, is designed to execute malicious code, likely downloading a secondary payload. The ClamAV detection 'Pdf.Exploit.Agent-36121' further confirms the exploit nature of this file, suggesting it was delivered as a spearphishing attachment.

Machine Learning

Nyx PDF Classifier malicious score 0.9987

Heuristics 15

XFA form contains risky executable script high CVE related PDF_XFA_SCRIPT

PDF embeds an XFA form whose script block contains exploit, submission/launch, or shell-execution primitives. Ordinary LiveCycle print/update scripts are left as generic XFA/JS signals unless stronger behavior is present.
PDF JavaScript exploit cluster critical PDF_JS_EXPLOIT_CLUSTER

PDF combines an executable JavaScript/action surface with exploit staging indicators such as eval/unescape/fromCharCode, XFA script content, or a related CVE pattern. Benign form JavaScript remains low-severity, but this correlated cluster is high-confidence malicious behavior.
XFA JavaScript heap-spray exploit code critical PDF_XFA_HEAP_SPRAY

PDF contains XFA script content with heap-spray or shellcode-like JavaScript markers such as large encoded word sequences, util.pack, large arrays, or spray variable names. This is a weaponised Adobe Reader exploit pattern, not a normal interactive form.
Secondary embedded PDF body has suspicious static findings critical POLYGLOT_CHILD_PDF_STATIC_TRIAGE

A valid PDF body was found at a nonzero offset inside another container and its carved contents matched PDF exploit or lure heuristics. This catches polyglots where the top-level magic routes to ZIP/OLE while a PDF reader or downstream parser opens the hidden PDF payload.
ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV

ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
unescape() call high PDF_UNESCAPE

unescape() found — often used to decode shellcode in PDF JS exploits (matched inside decoded stream)
Embedded script payload in PDF stream medium PDF_EMBEDDED_SCRIPT_PAYLOAD

PDF stream bytes contain an HTML/XFA <script> tag without accompanying Windows shell-execution primitives — common in accessible XFA forms but worth surfacing for analyst review.
JavaScript action low PDF_JAVASCRIPT

PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded JS stream low PDF_JS

PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
Embedded file low PDF_EMBEDDED

PDF embeds a file attachment — could carry an executable or another weaponised document as a nested payload
XFA form low PDF_XFA

PDF uses XML Forms Architecture — can contain script logic
AcroForm button with action trigger low PDF_ACROFORM_BUTTON

PDF contains a /Btn form field together with a SubmitForm/URI/Launch/JS trigger — this is the building block of fake 'Download' or 'Open' button overlays used in PDF phishing lures
Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL

The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL http://ns.adobe.com/xdp/
- http://www.xfa.org/schema/xci/1.0/
- http://www.xfa.org/schema/xfa-template/2.5/
- http://ns.adobe.com/xtd/
- http://www.xfa.org/schema/xfa-data/1.0/
- http://ns.adobe.com/xfdf/
- http://www.xfa.org/schema/xfa-form/2.8/

Extracted artifacts 18

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`embedded_file_obj0008.bin` `d81baa73e490e4cb879e13927cacd1dd1be37524a37eac51603e15117c578777`	pdf-embedded-file	PDF EmbeddedFile object 8 at offset 0x110B	84 bytes
`embedded_file_obj0009.bin` `24c130f03a4cf51d470b536e94c1e58af67665739e200e0ce198ad41086243c0`	pdf-embedded-file	PDF EmbeddedFile object 9 at offset 0x11BC	228 bytes
`embedded_file_obj0010.bin` `39dfddee0f947a0ec3fa3a49a5101bb8cb4d76f70a64f90e6a000b4d38c51779`	pdf-embedded-file	PDF EmbeddedFile object 10 at offset 0x12AF	27952 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`embedded_file_obj0011.bin` `c97e0522381d6196cc0695f35f4d065f15c9c86a9601a7f776c6afd3f4c6b460`	pdf-embedded-file	PDF EmbeddedFile object 11 at offset 0x44DB	199 bytes
`embedded_file_obj0012.bin` `fd826763856c25d2203abc9b9f5d29f72ec02e0cceb9490df7b6b63abc1f9bb0`	pdf-embedded-file	PDF EmbeddedFile object 12 at offset 0x45CD	131 bytes
`embedded_file_obj0013.bin` `e6c26a3478346d27e841ad49868ebf68bf4c6863b6750e8d60bda3c4c6f79876`	pdf-embedded-file	PDF EmbeddedFile object 13 at offset 0x468D	77 bytes
`embedded_file_obj0014.bin` `92a3ce61d783e15932b5de127ce45a9b4c2f98f4da2453f65241573c1dda808a`	pdf-embedded-file	PDF EmbeddedFile object 14 at offset 0x4734	56 bytes
`javascript_obj0008_000.js` `7a100fac8035463c4dcd83ce7f989376979cb64e101eb0ee7787d1116bbac2d2`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	19079 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0008_001.js` `833ff6ee02db1764f62173a02f5e6d6b9977205875397f51832b0fae9b0353bd`	pdf-javascript-stream	PDF /JS object 8 at offset 0x20A	524288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`polyglot_child_pdf_off00004d32.pdf` `83007fe713a5825c5ed357a6845edd8b314385e0b9e6bfca04c985bc6cf97eb2`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x4D32	2028238 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`javascript_obj0008_000_1.js` `3d394a19cead4d9e143bf4b7a76b28546c38290f61fd1d9f29cbe76f11a26798`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	19151 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`javascript_obj0008_001_1.js` `4c1bef1f235b2da6cdff0bee908980cda17885321701b1536fde6566db5c7a33`	pdf-javascript-stream	PDF /JS object 8 at offset 0x20A	524288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`polyglot_child_pdf_off00009abd.pdf` `218fb808200bbb33b27a7d399cbd341c75b5f05e80a4381e9880f442bdaa3176`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x9ABD	2008387 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).
`javascript_obj0007_000.js` `fe482fae2692fa3e43822ecdc93faf1e9eba657033b5da8a768f59db37e36e10`	pdf-javascript-stream	PDF /JS object 7 at offset 0x9D0	488 bytes
`javascript_obj0008_001_2.js` `9a57fb8437d73d3a37c5d64e00a0f03634f2282ad0aad0e122f97043a63fd430`	pdf-javascript-stream	PDF /JS object 8 at offset 0xEE7	524288 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`polyglot_child_pdf_off0000e890.pdf` `b2e261bde3178f2b2840a65374275a72260faccf6b347a870c45fec04c4c2179`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xE890	1988464 bytes
Detection ClamAV: Pdf.Exploit.Agent-36121 Obfuscation or payload: unlikely
`javascript_obj0008_000_2.js` `8354c90db245b97378cf1ac7a96bb8481b6dace579e742a69e1d80e6ab900aa8`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	19711 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).
`polyglot_child_pdf_off0000f56d.pdf` `712b3339b1033526da335723b092dc15a6acca73e6063062333d99303ea89af5`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xF56D	1985171 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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