PDF malware analysis — malicious · 57d4d7438465e098

MALICIOUS

PDF

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

MD5: ca834d308f8eb7ca6d23c8f2f0c29754 SHA-1: d34163072aea7c8b299f3cbcf8b7638d66a2b545 SHA-256: 57d4d7438465e0989295ea37712188de05893f1945c76ab1d936eed1ad248328

72 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The PDF was flagged as malicious by an ML classifier with high confidence. Static analysis identified an embedded script payload within a PDF stream, which is a common technique for delivering malware. The extracted artifact 'stream_002_off00000317.js' is likely the malicious payload. The presence of XFA forms and embedded files further supports a malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 1.0000

Heuristics 6

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_off00000317.js` `95360d5643fceb814191240a5eb0f06e7b76644cf8e6cc9067ce7befafca8771`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x317	61689 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains 1 long base64-like blob(s).

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