PDF malware analysis — malicious · 28525eb6cbc1b9cd

MALICIOUS

PDF

1.95 MB

MD5: 5712b3242f90de8928811fd81d7d6310 SHA-1: a532eaa88ef393a189a36ccbb791af850cbbcb7d SHA-256: 28525eb6cbc1b9cd0a54541d3ddf9f5979b9ce31bb9e003178a95da20bf2de4f

188 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF file contains multiple embedded JavaScript streams, with one stream exhibiting high confidence findings for eval() calls and String.fromCharCode usage, indicating obfuscation. The ClamAV detection and critical heuristic for a secondary embedded PDF with suspicious static findings strongly suggest a dropper functionality. The embedded JavaScript is responsible for downloading and executing a secondary payload from the reconstructed URL 'http://192.168.1.1/payload.exe'.

Heuristics 8

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: Pdf.Dropper.Agent-7241941-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Dropper.Agent-7241941-0
eval() call high PDF_EVAL

eval() found — commonly used for obfuscated exploit execution (matched inside decoded stream)
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.
String.fromCharCode low PDF_FROMCHARCODE

String.fromCharCode found — used to construct payload strings dynamically. Common in benign JavaScript libraries for codepoint manipulation, so this alone is informational; weaponised use is also caught by the dedicated fromCharCode-stage and exploit-shape rules. (matched inside decoded stream)
PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED

The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
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.

Extracted artifacts 9

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`javascript_obj111711_000.js` `81ce03a90a2c0ef5252218223ed8bbac0a54f9cee86d0313d2ecd07551976896`	pdf-javascript-stream	PDF /JS object 111711 at offset 0x197	370 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj111712_001.js` `8171224f22a8be3cd36646e551f0497e5d8ea92069820da3889ba37374a6d559`	pdf-javascript-stream	PDF /JS object 111712 at offset 0x246	2950 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s).
`javascript_obj0008_000.js` `03dc6913b1b7606c094a44681168c6b627f0a62c1d807ab31240319d37548942`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1850 bytes
`legacy_pdfkit_stage_000.js` `aa2be694f56b465b575cc382d831f3e467a4fe15e581465f8c7e7cadb082c60a`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x955	256 bytes
`polyglot_child_pdf_off00000ad6.pdf` `f36a1ee6b47937eb9dec6708f2654579cae2b2954ac04cfce4487a3a31657ff0`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0xAD6	2045226 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 long base64-like blob(s).
`javascript_obj0008_000_1.js` `e0d64f1b62351e8ae9dcadb57ce75785822c1bb3a2a3b3ff9ef7babcf7e59221`	pdf-javascript-stream	PDF /JS object 8 at offset 0x1E7	1672 bytes
`legacy_pdfkit_stage_000_1.js` `77f40a75b10286d73737525ffcb84979d64f5e28693ee66f485c04ebea1690a1`	deobfuscated-js	repeated-marker hex decoded JavaScript at offset 0x8A3	125 bytes
`legacy_pdfkit_stage_001.js` `bae20fc1cca32d8650b9be61640b90b39b06781911f0bc563c48e0ec11fdb12c`	deobfuscated-js	double percent-decoded annotation JavaScript at offset 0x8A3	1894 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 3 eval/decoder/string-building token(s).
`polyglot_child_pdf_off00001ae7.pdf` `925ab1b002d9cc1173df4a9e8feffd5e48e0323fe96cc6804bd0eac4259fb1a3`	polyglot-child-pdf	Secondary PDF body inside pdf container at offset 0x1AE7	2041113 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 2 long base64-like blob(s).

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