PDF malware analysis — malicious · c93d5f011af28fc5

MALICIOUS

PDF

5.2 KB Created: 2012-06-11 17:19:01 Authoring application: zPn

MD5: ea52365e9345e06a38b0b53c37dc87ef SHA-1: 1c006de70d743e41ca60c519e2c3d025b78f6537 SHA-256: c93d5f011af28fc5f8dd08426bccfe4e6a980c7752c2265d462d1c1e0a2d9e5e

154 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1566.001 Spearphishing Attachment T1071.001 Web Protocols

This PDF file was flagged as malicious by an ML classifier with high confidence. Static analysis revealed the presence of an embedded JavaScript payload within an XFA form, indicated by PDF_XFA_SCRIPT and PDF_EMBEDDED_SCRIPT_PAYLOAD heuristics. The script, identified as stream_002_off00000315.js, is likely responsible for downloading and executing a second-stage payload. The PDF_UNESCAPE heuristic suggests obfuscation techniques were employed within the script.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 8

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.
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.
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
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.
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 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_002_off00000315.js` `087ad580d32cdaa61498bf36a6d26002ba3ecefb27f1b0da5a0d9c2cfc84b039`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x315	60917 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 eval/decoder/string-building token(s). Carved artifact contains 1 long base64-like blob(s).

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